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Well I remember at one time they were playing with the idea of a radio controlled gun lock, essentially the officer wore a ring with a very short range radio transmitter, with a range measured in inches. If you don't wear the ring, the gun doesn't fire.
What I would like to see is something similar, but using an implant rather than a ring. They have been experimenting with implant identification for years and this would be a very practical use for it. Ultimately this boils down to a solenoid triggered safety, I have a version of this on my key chain that I use to get into my office.
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